裂缝性注水开发油藏多轮次调剖机理研究

摘要/Abstract

摘要：

为了探讨多方向见水井控水的技术对策,有必要弄清油藏多方向见水规律,认识多轮次调剖技术的调剖机理.实验通过设计制作平面裂缝—基质可视化模型,模型为一注三采,不同注采端口之间的渗透率不同,研究在裂缝—基质条件下凝胶的运移特征及封堵机理,后续水驱的液流改向,残余油的分布特征;通过不等渗透率并联填砂管岩心流动实验,模拟油藏的层间非均质性,对单次调剖和多级调剖操作的实验数据进行对比.实验结果发现对于裂缝性油藏,多轮次调剖可以充分发挥协同作用提高调剖效果,能使裂缝渗流通道得到有效封堵,具有良好的促进后续流体转向的作用,且调剖效果存在逐次递减现象;多轮次调剖技术较单次调剖技术能更好适用于裂缝性地质构造的调剖施工作业,起到更好的缓解层间矛盾的作用.

关键词: 裂缝性油藏, 物理模拟, 可视化模型, 多方向见水, 多轮次调剖, 提高采收率

Abstract:

In order to discuss the technical measures of the multi-directional water breakthrough, it is essential to find out the water breakthrough discipline and the understand the mechanism of the multi-round profile control technique. Therefore, we designed and the established the fracture-matrix visualization model with one-injection well for three production wells. The permeability between the different injection-production ends was inequality. By this model, we studied the migration characteristics and the plugging mechanism of the gel, the fluid diverting of subsequent water flooding and the distribution characteristics of the residual oil on the condition of the fracture-matrix. Through the core flow experiment of the shunt-wound sand-filled pipes with different permeability. And by the simulation of the interlayer heterogeneity, we compared the experimental data of the single and multi-round profile control measures. The results show that the multi-round profile control can fully play the synergistic effect to improve the performance and plug the fractured seepage channel effectively along with the promotion of the fluid diverting, and the profile control effect reduces with time of the injection. The multi-round profile control technique is better than the single profile control technique in the respect of adapting the fractured geological structure, and has a better effect on relieving the interlayer contradiction.

Key words: fractured reservoir, physical simulation, visualization model, multi-directional water breakthrough, multi-round profile control, EOR

中图分类号:

TE357

何涛,王健,余恒等. 裂缝性注水开发油藏多轮次调剖机理研究[J]. 油气藏评价与开发, 2018, 8(2): 68-72.

Tao He,Jian Wang,Heng Yu, et al. Mechanism study on multi-round profile control technique in fractured water flooding reservoir[J]. Reservoir Evaluation and Development, 2018, 8(2): 68-72.

图/表 7

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参考文献 10

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调剖轮次	采油量/mL			采收率,%
调剖轮次	上端	下端	左端	采收率,%
水驱	11	4	41	25.7
第一轮	14	9	8	14.2
第二轮	12	8	3	10.6
第三轮	5	3	1	4.1
总计	42	24	53	54.6

填砂管编号	渗透率/ μm²	水驱(调剖前) 相对吸水量,%	单次调剖后相对吸水量,%
1#	7.48	70.00	38.36
2#	2.99	28.18	56.21
3#	0.68	1.82	5.43

填砂管编号	渗透率/ μm²	水驱油(调剖前) 相对吸水量,%	第一轮调剖后相对吸水量,%	第二轮调剖后相对吸水量,%	第三轮调剖后相对吸水量,%
1#	5.48	69.60	47.17	14.49	24.25
2#	1.936	19.80	37.74	39.13	47.95
3#	0.327	10.60	15.09	46.38	27.80

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